Winding machine and process for winding a material web

Abstract

Apparatus and process for winding a material web into a wound roll on a winding core. The apparatus includes a press roll, movable press roll bearings coupled to the press roll, and a pressing device positioned to press the press roll against the wound roll. In this manner, the press roll and the wound roll form a winding nip, and the material web is guided the press roll and through the winding nip. The pressing device is adapted to set a line load in the winding nip, and movable winding core bearings are couplable to the winding core of the wound roll and are adapted to move the winding core to compensate for an increasing wound roll diameter. The winding nip one of remains in an at least approximately same position and is displaced by a small amount during winding. A driving device is positioned to move each of the movable winding core bearings, and a control device is arranged to control the driving device as a function of movement of the press roll from a desired position. A position measurement device, coupled to at least one of the movable press roll bearings, is adapted to produce an instantaneous position value of the press roll in accordance with a current position of the press roll, a regulator is adapted to compare the instantaneous position value with a desired position value of the press roll and to transmit an actuating variable that corresponds to a deviation of the instantaneous value from the desired value, and a wire is adapted to transmit the actuating variable from the regulator to the control device.

What is claimed:  
     
       1. An apparatus for winding a material web into a wound roll on a winding core, the apparatus comprising: 
       a press roll;  
       movable press roll bearings coupled to said press roll;  
       a pressing device being positioned to press said press roll against the wound roll, whereby said press roll and the wound roll form a winding nip, and wherein the material web is guided around said press roll and through said winding nip;  
       said pressing device being adapted to set a line load in said winding nip;  
       movable winding core bearings couplable to the winding core of the wound roll and being adapted to move the winding core to compensate for an increasing wound roll diameter, wherein said winding nip one of remains in an at least approximately same position or is displaced by a small amount during winding;  
       a driving device being positioned to move each of said movable winding core bearings;  
       a control device arranged to control said driving device as a function of movement of said press roll from a desired position;  
       a position measurement device, coupled to at least one of said movable press roll bearings, which is adapted to produce an instantaneous position value of said press roll in accordance with a current position of said press roll;  
       a regulator being adapted to compare the instantaneous position value with a desired position value of said press roll and to transmit an actuating variable that corresponds to a deviation of the instantaneous value from the desired value; and  
       a wire being adapted to transmit the actuating variable from said regulator to said control device.  
     
     
       2. The apparatus in accordance with  claim 1 , wherein said position measurement device is coupled to each of the movable press roll bearings, and 
       wherein said position measurement devices are further coupled to an average value provider that transmits an average instantaneous position value derived from the instantaneous position values of each of the movable press roll bearings to said regulator.  
     
     
       3. The apparatus in accordance with  claim 2 , further comprising a desired value transmitter coupled to said regulator to provide the desired value, 
       wherein the desired value, while adjustable, remains constant during a winding process.  
     
     
       4. The apparatus in accordance with  claim 2 , further comprising a desired value transmitter coupled to said regulator to provide the desired value, 
       wherein the desired value is variable during a winding process.  
     
     
       5. The apparatus in accordance with  claim 1 , wherein each of said press roll bearings is coupled to said position measuring device and to said regulator, 
       wherein said driving device comprises two driving devices and said control device comprises two control devices, and  
       wherein said two driving devices are respectively coupled to said two control devices, and said two control devices are each coupled to receive the actuating variable transmitted from said regulator.  
     
     
       6. The apparatus in accordance with  claim 5 , wherein said regulator comprises two position regulating devices, and said apparatus further comprises a desired value transmitter coupled to said two position regulating devices. 
     
     
       7. The apparatus in accordance with  claim 6 , said desired value transmitter being adapted to transmit the same desired values to said two position regulating devices. 
     
     
       8. The apparatus in accordance with  claim 6 , said desired value transmitter being adapted to transmit a constant desired value to one of said two position regulating devices and to transmit a cyclically variable desired value to the other of said two position regulating devices. 
     
     
       9. The apparatus in accordance with  claim 6 , said desired value transmitter is adapted to transmit to said two position regulating devices desired values that cyclically vary opposite one another. 
     
     
       10. The apparatus in accordance with  claim 1 , wherein said press roll comprises a carrier drum, the winding core comprises a reel spool, and the material web is composed of one of paper and cardboard. 
     
     
       11. The apparatus in accordance with  claim 1 , wherein the small amount which the winding nip is displaced is between approximately 10 and 200 mm. 
     
     
       12. A process for winding a material web comprising: 
       positioning a wound roll adjacent a carrier drum;  
       pressing the carrier drum against the wound roll with a pressing device, whereby a winding nip is formed;  
       guiding the material web around the carrier drum and through the winding nip;  
       moving the wound roll, in accordance with an increasing wound roll diameter, such that the winding nip one of remains in an at least approximately same position and is displaced by only a small amount;  
       measuring an instantaneous position of the carrier drum;  
       comparing the measured instantaneous position of the carrier drum to a desired position of the carrier drum;  
       transmitting an actuating signal which corresponds to a difference between the compared positions; and  
       moving the wound roll in accordance with the actuating signal.  
     
     
       13. The process in accordance with  claim 12 , wherein said measuring of the instantaneous position comprises: 
       measuring an instantaneous position for each end of the carrier drum; and  
       averaging the measured instantaneous positions as the instantaneous position.  
     
     
       14. The process in accordance with  claim 13 , wherein the desired position, while adjustable, remains constant during winding. 
     
     
       15. The process in accordance with  claim 13 , wherein the desired position is variable during winding. 
     
     
       16. The process in accordance with  claim 12 , wherein said measuring of the instantaneous position comprises measuring an instantaneous position for each end of the carrier drum, 
       wherein said comparing comprises independently comparing, in separate regulators, the respective instantaneous positions for the carrier drum ends to the desired position of the carrier drum, and  
       wherein said transmitting of the actuating signal comprises independently transmitting actuating signals to separate devices for displacing the carrier drum.  
     
     
       17. The process in accordance with  claim 16 , further comprising: 
       coupling a desired position transmitter to each of the separate regulators; and  
       transmitting the desired position of the carrier drum to each of the separate regulators.  
     
     
       18. The process in accordance with  claim 17 , wherein said desired position transmitter transmits a same signal to the separate regulators. 
     
     
       19. The process in accordance with  claim 17 , wherein said desired position transmitter transmits a constant position signal to one of the separate regulators and transmits a cyclically variable desired position signal to another of the separate regulators. 
     
     
       20. The process in accordance with  claim 17 , wherein said desired position transmitter transmits desired position signals to the separate regulators that cyclically vary with respect to each other. 
     
     
       21. The process in accordance with  claim 12 , further comprising axially adjusting the position of the material web on the wound roll. 
     
     
       22. The process in accordance with  claim 12 , further comprising pivoting the winding nip, whereby the material web axially traverses the wound roll. 
     
     
       23. An apparatus for winding a material web into a wound roll on a winding core, the apparatus comprising: 
       a press roll;  
       a pressing device being positioned to press said press roll against the wound roll, whereby said press roll and the wound roll form a winding nip;  
       a moving device for moving the winding core of the wound roll to compensate for increasing wound roll diameter during winding, whereby said winding nip one of remains in at least approximately the same position and is displaced by a small amount during winding;  
       a driving device being positioned to move said moving device;  
       a control device arranged to control said driving device as a function of movement of said press roll from a desired position;  
       a position measurement device being adapted to produce an instantaneous position value of said press roll in accordance with a current position of said press roll;  
       a regulator being adapted to compare the instantaneous position value with a desired position value of said press roll and to transmit an actuating variable that corresponds to a deviation of the instantaneous value from the desired value; and  
       said control device being coupled to receive the actuating variable from said regulator.